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Patented Mar. 26, 1889.

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- P.1GUILLAUMIN.

WEIGHING' MACHINE. V No; 400,400. Patented Mar. 26, 1889.

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' on which the registeringbeams are mounted.

PIERRE GUILLAUMIN,

WEIGHING- PATENT OFFICE.

OF VOIRON, FRANCE.

MACHINE.

SPECIFICATION forming part of Letters Patent No. 400,400, dated March 26, 1889.

Application filed January 9, 1888, Serial No. 260,248. (No model.) Patented in France May 2, 1881, and September 19, 1887, No. 185,980; in England May 6, 1887,1110. 6,686; in Belgium September 9,188'7,N0. 78,827; in Luxemburg September 9,1887,No. 890; in Italy September 10, 1887, No. 22,244: in Germany September 16 1887, No. 43,850; in Austria-Hungary September 21, 1887, No. 37,049 and No. 66,089, and in Russia October 3,1887, No- 8,760.

To all whom, it may concern:

Be it known that I, PIEEEE GUILLAUMIN, a citizen of the Republic of France, residing at Voiron, in said Republic, have inventedanew and useful Improvement in Weigh-Bridges and lVeighinghlachines, (for which a patent was granted to me in the said Republic of France May 2, 1881, No. 185,930, and also dated September 19, 1887; in Great Britain, No. 0,686, dated May 6, 1887; in Belgium, No. 7 8,827 dated September 9, 1887 in Germany, No. a3,850, dated September 16, 1887; in Italy, No. 222%, dated September 10, 1887; in Luxemburg, No. 890, dated September 9, 1887; in Austria-Hungary, No. 37,04c9 and No. 66,089, dated September 21, 1887, and in Russia, N 0. 8,760, dated October 3, 1887,) of which the following is a specification.

I'Ieretofore, in order properly to graduate the beams of scales for weighing heavy things so that they would be accurate, either expensive and complicatedmachinery was required or sufficient weights or weighted material to prove each separate graduation. I11 fact, no scale could be warranted accurate without such test-weights.

The object of my invention is to produce a scale which shall be capable of verifying its own weight by the use of fractional parts of that weight, substantially as hereinafter specified; and the nature of the invention consists in the details of combination and construction, substantially as illustrated in the drawings, hereinafter described, and subseqently pointed out in the claim.

Figure 1 is a side view in elevation illustrating the registering part of my improved weighing-bridge and the top of the platform on which the material to be weighed is deposited. Fig. 2 is a plan View illustrating the levers which sustain the platform. Figs. 3 and 4c are detail views illustrating the stand Upon the stand 111 are mounted in proper bearings the two scalebea1ns I I and K K, one above the other, as illustrated. The platform-lever C is attached to the lower beam, K K, at A by the link, and the rod 0, which is attached to said lever O at 0'. The platform P is mounted on the ordinary triangular levers, L Z, and adapted to receive the articles to be weighed. The fulcrum of the beam K K is near the link A A. At A is hung a counterpoisc, S. The upper beam, I I, is fulcrumed at I in the upright arm of the stand, and projecting without the upright arm is connected by the jointed link B to the lower beam, K K. 011 the lower beam are two Ps or movable weights, Q. and q. On the upper beam is only one P or movable weight, Q.

The space designated by the dotted line F is divided into two parts, one designated by the dotted line T, the other by the dotted line i. The spacet is graduated to represent units of the system of weights for which the scale was built. In the example given it is for kilograms. The space T is graduated for a fractional part of the unit of weight. In the example given it is one one-hundredth of the kilogram. he space upon the upper beam (indicated by the dotted line T) is graduated for a smaller fraction of the unit of weight than the space T of the lower beam. I11 the example given this graduation is for thousandths of a kilogram. Upon the beam K K over the space T moves the P Q and over the space 25 moves the P g. Upon the beam I I over the space T moves the P Q. Upon the beam K K both lines of graduations are numbered from the outside end of the beam toward the fulcrum; but the graduations of the upper beam are numbered in the usual way from the fulcrum outward. Upon the link B is hung a receptacle, B, in which are to be placed the detached weights, (designated by V of Fig. 3,) which represent various sums of the unit of weight, the whole weighing apparatus to be substantially as illustrated in the drawings.

To use this weighing apparatus, the article to be weighed is deposited 011 the platform P, as usual. Then within the receptacle B is placed one or more of the detached weights before described until the end of the beam K K comes down in the usual way. Then the operator, by summing the amounts represented by the weights V in B, will have an indication of the weight of the article on the platform. To

prove this, and be sure that it is accurate, the operator (while the article is still on the platform and V in B) moves first the P g along the graduations t until he finds the graduation which will balance the scale. If the scale be correct, that graduation should indicate an amount equal to the sum of the weights V. If, however, he cannot balance the scale with the P g, he must have recourse to the P Q, moving it on the graduation in the space Tan adjunct to determine the fractional parts of its denomination. If he can thus balance the scale with the two Ps Q and q, the indication given by the graduations will be in the example here given units and hundredths of an unit of the weight. If, however, the operator cannot accurately balance the scale with the two Ps Q and q, he must have recourse to the P Q, moving it on the upper beam, I I, until the scale balances. Then for the P g the graduation in the example given will indicate the units of weight, the P Q the hundredths of an unit of weight, and the P Q the thousandths of an unit of Weight, If the sums of the weights V and the sums of the indications on the beams be the same, the scale is correct and accurate. If, however, there be a difference between these sums, then that difference is the variation of the scale.

It is obvious that any unit of weight and any fractional parts thereof may be used instead of the example here given. I

IVhat I claim as my invention, and desire to secure by Letters Patent, is-

In a weighing apparatus, the combination of the platform P, the levers L], the connect ing-lever O, the connecting-rod 0, and the stand M, with the beams K K and I I, the eounterpoise S, attached to said beam K K, the link A, attaching the beam K K and the connecting-rod 0, the jointed link B, connecting the two said beams and supporting the receptacle B, the Ps Q, q, and Q, the graduations T, t, and T, and the weights V, substantially as and for the purpose set forth.

In witness whereof I hereunto set my hand in presence of two witnesses.

PIERRE GUILLAUMIN.

\Vitnesses:

.I. REvULE, O. BOUGET. 

